Flue and flue section



W. M. CONNERY.

FLUE AND FLUE SECTION.

APPLICATION FILED MAR. 16. I92l.

Patented May 16, 1922..

2 SHEETS-SHEET I.

W. M. CONNERY.

FLUE AND FLUE SECTION.

APPLICATION FILED MAR. 16, 1921.

Patented May 16, 1922.

2 SHEETS-SHEET 2.

mmsw

were

PATENT IEL'UE AND IL'UE SECTION.

{Specification of Letters Patent.

Patented May 16, 1922.

Application filed March 16, 1921. Serial No. 452,755.

To all whom it may concern.

Be it known that 'l/VIL IAM M. Company, a citizen of the United States of America, residing at Philadelphia, county of Philadelphia, State of Pennsylvania, has invented new and useful Improvements in Flues and Flue Sections, of which thefollowing is a specification.

It is common to construct fines, wherein the wall of the flue is successively corrugated. The metal for this style of flue is generally relatively thin, hence the successive corrugations are constructed by a roll-- ing process. It is also well known that flues of this character are practical only for use in connection with relatively small boilers, furnaces or the like. It is likewisewell known and understood that flues for relatively large boilers, furnaces or other plants where intense heat 1s expelled," relatively thin metal constructed with successrvecor rugations for expansion and contraction cannot be used. Hence it must be borne in mind that in constructing fines for relatively large boilers or furnaces, it is necessary toernploy a special method, and a special con struction, so as to produce a flue employing; corrugations, to compensate for expansion and contraction.

Attempts have been made to utilize plates corrugated successively, to construct fines of rectangular shape, by placingthe edges of the plates together and welding them. In this construction, when the plates are placed edge to'e dge, the corrugations do not reg ister, hence there is no chance for the wall of the flue to expand and contract at the points where the plates are welded.

It has also been found apparent that even though the corrugations of the plates may register, namely the outer raised portions, the same contraction and expansion at these points are not the same as the contraction and expansion of the walls ,of the flue between the corners. This is particularly true on account of the raised parts of the corrm gations of two right angle disposed. plates merging together at the corner.

In reiterating it is impractical to use relatively thin metal plates successively corrugated, therefore plain heavy relatively thicksheet metal plates have been used in.

constructing lines for relatively large boilers, and furnaces and the like. The walls of such flues made up in this manner are reinforced by angle plates to prevent collapsing or crushing in, and in order to compensate for expansion and contraction, such plates are slidably connected. Such sliding connections, including bolts and rivets eventually become corroded, the'parts frictionally bind, hence the joint eventually becomes fixed, the parts immovable, therefore there isno chance for the walls of the flue to expand or contract. VVhen the joints become so fixed, namely as though the wall at such a point were constructed of a single plate, the wall of the flue is put under a very high tension, and those parts of the walls between the corners finally wrench upon the reinforcing angle plates, which will cause the flue to give away at various points. i

In the present invention it is not the aim to utilize broadly the idea of metal plates successively corrugated, it is not the aim to. utilize plain plates reinforced by angle ha with thesliding joint, these constructions do not involve any practicality, for the reasons above heretofore mentioned.

Therefore, when constructing lines for relatively large boilers, furnaces and the like, it is the aim to utilize the relatively heavy and large sheet metal plates, especially corrugating these plates at requisite infrequent intervals according to the size of the flue to be constructed, utilizing angle irons at the corners of the plain portions of the plates, either riveting or welding the angle irons in position, and in providing; inset pieces at the points where-the corrugations of the plain plates adjoin, then either riveting, welding or otherwise connecting said inset sections or plates, so as to provide uniform contour of corrugations around the corners.

This construction, which may be described by the method of making, permits aflue for a relatively large boiler or furnace or other device where intense heat is generated, to uniformly expand and contract, at the corners, and the walls between the corners.

Where plates,which are relatively heavy and thick, are corrugated at requisite infrequent intervals according to the size of fine to be constructed, the work can be acioo complished in a practical way, and in such wise, as to produce an article of manufao ture involving commercial merit, namely one which can be installed at a comparatively low cost, as compared to one constructed of relatively heavy thick sheet metal plates.

successively corrugated.

In carrying out this invention it is not the purpose to claim all uses, or to claim broadly a corrugated flue, whether it is infrequently or successively corrugated, but it is the aim to provide and claim a flue constructed from relatively heavy thick plates, which are in frequently corrugated, and assembled substantially as illustrated, for use in (miner-.- tion with relatively large boilers.

Mainly, the aim of this invention is to provide a construction and a method by which the construction is-produced, rendering it possible to employ infrequent corrugations in the flues which are employed in connection with relatively naces and the like.

A still further purpose is to provide a conduit composed of conduit sections subject to variations of temperature, and principally to simplify and cheapen the fabrication of the sections and the assemblage of the sections, and to provide a saving of material, to increase the strength and flexibility of the entire structure of flue, and, at the same time provide a better and safer method for taking care of the expansion and contraction than those constructions now in common use.

While the design and construction at present illustrated and set forth is deemed preferable, it is obvious that as a result of a reduction of the invention to a more practical form for commercial purposes, the invention may be susceptible of changes, and the right to these changes is claimed, orevided they are comprehended. within the scope of what is claimed.

The invention comprises further features and combination of parts, as will be herein.- after set forth, shown in the drawings and claimed.

In the drawing Figure 1 is a view in side elevation of the upper end of the boiler, furnace or the lilce showing one shape or contour of flue as applied, with the walls corrugated at suitable infrequent intervals.

Figure 2 is a perspective viewof one section of the flue, more clearly showing the interior and exterior structure, and also illustrating the, manner of connecting the inset corner pieces.

Figure 3 is a sectional view on line 33 of Figure 2, showing", theconstruetion and arrangement of the inset corner piece.

Figure 4 is a perspective view of a sec tion of flue showing a modifiedconstruction of fasteningthe inset corner, pieces.

Figure 5 is a perspective view of one of large boilers, furthe heavy thick sheet metal plates of each section of flue showing the infrequent corrugations. I

Figure 6 is a detail perspective view of one of the corner pieces.

Figure 7 is a sectional view on line 77 of Figure 4.

Figure 8 is a sectional view on line 88 of Figure 4;.

Referring to the drawings, the flue in Figure 1 may be any suitable shape or configuration, and may be applied in any manner, to any form of boiler, furnace, or adapted for any purpose for conveying intense heat. In fact the super-flue l is preferably rectangular, and the super-boiler E2 to which the flue is applied may be communicatively connected with the flue by the passages 3, or otherwise connected.

Mainly the flue is constructed in sections 4, such as shown in Figure 2'. Each section includes the angle irons 5 arranged at the corners of the flue, and to which the plates 6 (forming the sides, top and bottom of the flue) are connected, by means of rivets, bolts, or the like 7. If found convenient and practical the plates 6 may be connected to the angle irons by welding. I

These plates may constitute articles of manufacture. may-be made in various sizes, according to the sizes of flues which are at present constructed and employed, and theseplates are provided with corrugations 8. The corrugations, in the plates may be formed by any suitable means, preferably by means of a die and die block (not shown), as it has been found that plates which are relatively thick and'heavy, cannot, with practical results, be corrugated by a rolling process, especially, .in case where the corrugations are successively, not infrequently, formed.

In constructing the corrugations in the plates, they are arranged at requisite infrequent intervals, according to the size of plate and the size of section of flue to be constructed, and may be made any depth, but likewise depending upon the size of plate and section to be constructed. Preferably the corrugations are to be of considerable depth, in order to insure requisite expansion and contraction of the flue.

As previously stated the plates are riveted or otherwise fastened to the angle irons 5, the sections of flue to be made up, as shown in Figure 2, and the sections subsequently connected, in Figure 1. The an gle irons 5 are arranged at'the corners of the flue at pointsintermediate the corrugations, In other words the ends of the angle irons terminate adjacent the corrugations. The angle irons also act to connect the sections ofthe .flue. Plates 9 are arranged transversely of the side plates of the flue andare riveted or otherwise fastened thereto as at 10, and are interposed between the angle irons at the corners of the flue. The plates 9 also assist in connecting the sections of the flue, as will be obvious from first inspection of the drawings. The plates 9- may be eliminated if desired, and the joints between the sections, at points intermediate the angle irons may be otherwise formed.

It will be noted that when the plates 6, as shown in the detail view of Figure 5 are assembled to form the flue the ends of the corrugations remain unattached, therefore it is necessary to connect the ends of the corrugations. On first sight it would seem that the plates could be corrugated, and so formed, that when the plates are joined, the corrugations would meet at their ends, only necessitating a weld, to complete the formation of the joint at the corners of the corrugations. To make a joint of this kind, it would necessitate forming the corrugations, then mitering their ends, so that the corrugations would register. To. form a mitre of the corrugations, it would necessitate the cutting away of the plate at points between the corrugations. This process is more or less eXpensive,and has not been found practical, particularly due to the difficulty in 'obtaining the proper size of. fine, as well as the difficulty in cutting the plates.

Therefore it has been found practical, and of commercial merit to subsequently connect the ends of the corrugations, by means of inset sections or corner pieces 11. These inset corner pieces as in Figures 1, 2 and 3 may be of the exact size to fit between and connect the adjacent ends of the'corrugations, and may be subsequently welded, brazedor otherwise connected to the ends of the corrugations, as indicated at 12.

The inset corner sectionsor pieces may be otherwise constructed, for instance as shown in Figures 4 and 6, particularly the latter and the corner sections or pieces 1.3 are of suflicient size to overlap the ends of the corrugations, as indicated at 14 in Figures 4 and 8. Furthermore the corner piecesor sections 13 have lateral cornenextensions 15 corresponding to the angle irons and fitted at the corners of the fine, as shown clearly in dotted lines in Figure '42. These corner sections or pieces 15are riveted, bolted or otherwise connected at 16 to the ends of the corrugations. Even though the corner pieces or sections 13 are shown as riveted in Figures a, 7 and 8, and even though they overlap the ends of the corrugations, they may be welded to the ends of the corrugations, either a'solid weld, or several spot welds. Then the ends of the corrugations are. so connected, and the plates of the sections of the flue connected, it is obvious that the fine is capable of expansion and contraction, due to the intense heat passing through the flue. The present construction of device, formed in sections, is designed primarily for conducting air, smoke and other gases.

In this construction of fine and flue'sections, the usual heretofore-used stiffening angle irons (not shown) employed transversely of. the walls of the flue are entirely eliminated, and in lieu thereof the walls of the flue are constructed of plates with relatively deep corrugations at requisite infrequent inte vals are employed, thereby facilitating the expansion and contraction of flue.

As heretofore stated the corrugations are only permissible at infrequent intervals, and furthermore the particular shape of corrugations as shown is not absolutely essential, as the radii-of the corners of the C01r11g'a tions may be altered if found necessary, in order to make the fabrication of the flue easier.

Furthermore the elimination of the usual transversely disposed stiffening angles reduces greatly the total weight of the structure.

Furthermore considerable of the cutting and punching and riveting of these angles entails care and labor, and by the present form of construction such care and labor is greatly reduced, if not entirely eliminated, as'it may be possible to weld practically all the parts of the flue. The various bends or corrugations may be formed in any width or length of plate, by means of suitable dies, and the impressions of the corrugations or bends are made very cheaply, and further more a machine (not shown), for performing this work, together with the die acts to standardize the labor required for fabrication and the assemblage may be reduced to a minimum. Furthermore the corner inset sections or pieces may be made to extend any size, and may be readily compressed from scrap material, by means of a drawing die (not shown).

The invention having been set forth, what is claimed is:

1. As an article of manufacture, a flue section comprising sheet metal plates connected to formthe four sides of the section, each plate being provided with relatively deep corrugations, located at requisite infre quent intervals, inset sections or pieces be tween the straight portions of the corrugations, and means for connecting the inset sections or pieces to the corrugations.

2. A flue section composed of sheet metal plates disposed to form a flue of. rectangular formation, means for uniting said plates at the corners of the flue section, said 'plates having relatively deep corrugations located at requisite infrequent intervals, inset sections or pieces between the ends of the corrugations, and means for uniting the inset pieces or sections and the corrugations.

3. As an. article of manufacture, a flue section comprising sidewalls of sheet metal plates, angle irons connecting the plates at -he corners oi? the flue at interrupted intervals, said plates havingtransversely arranged corrugations at requisite infrequent intervals, inset corner sections or pieces at the adjacent ends of the corrugations, means for uniting the inset corner sections or pieces and the ends of the corugatio s.

4:. A. flue section comprising walls oi sheet metal plates, angle irons connecting the sheet metal wall plates at the corners or the flue, said-plates having relatively deep transversely di posed corrugations at requisite infrequent intervals, the corrugations of each plate beine arranged coincident to the corrugations oi the adjacent plate, inset corner sections or pieces between the ends otthe corrugations, and. means for uniting the inset pieces to the ends of the corrugations, means extending along the edges of the ends of the wall plates for connecting the ends of one flue section to an adjacent flue section.

5. A flue section comprising walls of: sheet metal. plates, said plates being provided with relatively deep corrugationsat requisite infrequent intervals, means connecting the wall plates at the corners of the flue section, inset corner sections or pieces between the ends of the corrugations, and rivets connecting the inset corner sections orpieces to the corrugations. I

'6. A fluesection comprising walls of sheet metal plates, said plates being provided with relatively deep corrugations at requisite in: frequent intervals, means connecting the wall plates at the corners of the flue section, inset corner sections or pieces between the ends of the corrugations, said inset corner pieces overlapping the adjacent ends oi? the corrugations, and means for fastening the overlapping parts of the inset corner sections or pieces and the ends of the corrugations.

7. A flue section comprising walls of sheet metal plates, said plates being provided with relatively deep corrugations at requisite infrequent intervals, means connecting the wall plates at the corners of the flue section, inset corner sectionsor pieces between the ends of the corrugations, said inset'corner pieces overlapping the adjacent ends of the corrugations, and means for fastening the overlapping parts 01. the inset corner sec tions or pieces and the ends of the corrugations, said inset corner sections -or pieces having extensions fitting in the corners at points where the wall plates are united.

8. A flue sectioncomprising walls of sheet metal plates, said plates being provided with relatively deep corrugations at requisite infrequent intervals, means connecting the wall plates at the corners of the flue section, inset corner sections or pieces between the ends of the corrugations, said inset corner pieces overlapping the adjacent ends of the corrugations, and means for fastening the overlapping parts of theinset corner sections or pieces and the ends of" the corrugations, said inset corner sections or pieces having extensions fitting in the corners at points where the wall. plates are united, means at the ends of the wall plates oi the flue sectionsytor unitingthe flue seotionto an ad jacent flue section.

9. A flue section comprising sheet metal wall plates, said plates being provided with relatively deep corrugations requisite infrequent intervals, angle irons connecting the wall plates at the corners of the fluesectionat interrupted intervals coincident to the location of the corrugations, inset corner sections or pieces adjacent the ends of the corrugations, said inset corner sections or pieces overlapping the ends of the corrugations, means for ,iiastening the overlapping parts together, said inset corner sections or pieces havinglateral extensions engaging in the, corners otthe flue and registeringwith angle irons, whichv fasten the sheet metal wall plates together.

10. As air article of manufacture, a flue wall plate constructed. from relatively thick sheet metal, provided with transverse rela tively deep corrugations formed at requisite infrequent intervals and provided adjacent its marg'n with openings for the reception of rivet-s. v v

11. As an article of manufacture, a wall composed of sheet metal plates, said wall having transversely disposed relatively deep corrugations, disposed at requisite infrequent intervals.

12. As an article of: manufacture, a super heat flue of angular contour in cross sectional area, the wall of the flue having infrequently arran 'ed transverse corrugations formed over the angularcorners of the flue, the corners of the corrugations being, of diftf'erent pieces than the straight portions of the corrugations, the construction and ar rangement of the corrugations and their angular corners being such that the expansion and contraction subjected to the walls of the flue are transmitted direct to the corrugations and their angular corners, where by theflue may expand and contract uniformly. a

In testimony whereof, the inventors signature is hereunto aflixed.

WILLIAM M. ooNNnRY. 

